Fastmail account not working

What happened?
I added my Fastmail account and also an iCloud account. I don’t see any folders or messages for the Fastmail account.
The app icon has a badge that shows “19” but there are only 5 unread emails in the iCloud account so it seems it’s counting the unread messages of the Fastmail account.
The app shows an error at the bottom that says “ A problem occured: unexpectedResponse(nil)” (“occurred” is missing an “r”)

What did you expect to happen?
I expected to see my Fastmail messages

Steps to reproduce
Add a Fastmail account

What version of iOS?
iOS 17 developer beta

What build number of Big Mail?
(You can find this in TestFlight)
2.0 (22)

Thanks for the report!

Out of interest, does the account appear in the main list (below your Smartboxes). And what about the account settings, does it appear there? What happens if you close the app and try syncing again?